Fleet Cost Per Vehicle Calculator
Enter the details for a typical fleet vehicle to see a full annual cost breakdown — lease payments, employer National Insurance, employee BIK tax, and fuel or energy costs — then scale to your fleet size.
Frequently asked questions
What costs should a fleet manager budget for?
The main costs per fleet vehicle are: lease or finance payments, employer Class 1A NI on the BIK value (15% for 2026/27), fuel or electricity, insurance, maintenance, and road tax. This calculator covers lease, employer NI, and fuel — the three largest variable costs that differ significantly by vehicle choice.
How much does employer NI add to the cost of a fleet car?
Employer Class 1A NI at 15% is charged on the taxable benefit (BIK value) of each company car. For fleet budgeting purposes, this calculator applies the 15% rate to the lease cost as a proxy for the employer cost. The actual Class 1A NI liability is based on the P11D value and BIK rate, reported on form P11D(b).
Are electric fleet vehicles cheaper to run?
Yes, typically by a significant margin. Electric vehicles have lower fuel (energy) costs — roughly 5-8p per mile compared to 15-20p for petrol. They also attract the lowest BIK rate (2%), reducing employer NI on the BIK. Combined savings can be 40-60% per vehicle per year compared to equivalent petrol or diesel cars.
What efficiency figure should I use for fleet vehicles?
For petrol/diesel, use real-world MPG (usually 15-20% lower than the official WLTP figure). For EVs, use real-world miles per kWh — typically 3-4 mi/kWh for cars and 2-3 mi/kWh for vans. Your telematics system or fleet management software should have actual figures.
Does this include Class 1A NI on the BIK?
The employer NI shown is estimated on the lease cost for fleet budgeting. The actual Class 1A NI liability is 15% of the BIK value (P11D x BIK rate), which is reported and paid annually by the employer via form P11D(b). For EVs at 2% BIK, this is a small amount — for higher-emission cars it can be substantial.
These calculations are estimates based on 2026/27 HMRC and DVLA rates. Speak to a lender or qualified financial adviser for a personalised quote.